Substation-circuit.



J. J. LYNG.

SUBSTATION CIRCUIT.

APPLIOATION FILED MAR. 11, 1909.

Patented Nov. 22, 1910.,

STATEg PATENT @FFIQE.

JOHN J. LYNG, OF EAST ORANGE, NEW JERSEY, ASSIGNOR T0 VJESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SUBSTIATION-CIlR-CUIT.

Specification of Letters Patent.

Patented Nov. 22, 1910.

Application filed March 11, 1809. Serial No. 432,669;

Toall whom it may concern."

Be it known that I, JOHN J. LYNG, c1t1- zen of the United States, residing at East- Ora-nge, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Substation- Circuits, of which the following is a full, clear, concise, and exact description.

My invention relates to substation circuits of central energy telephone exchange systems, and contemplates means whereby proper capacity is given to the ringing circuit, which capacity, after the receiver has been removed from its switch-hook, is included in the talking circuit and there increased by the addition of capacity introduced in multiple therewith, to provide for eflicient transmission.

The present invention is particularly adapted for use in connection with substation circuits in which harmonic ringers are employed, and it was to enable a standard common battery substation circuit to be used where harmonic ringing is required, that the present circuit was devised.

In harmonic ringing it has been found that the best results are obtained by employing a condenser of a certain capacity in series with the ringer, and for eflicient transmission, a separate condenser of greater ca pacity should be employed. Ithas therefore been heretofore proposed to provide a condenser of given capacity bridgedacross the line in series with the ringer, and a separate condenser of greater capacity in the talking circuit.

In accordance with the present invention, the condenser which is normally in the signaling circuit is arranged to be connected also in the talking circuit when the telephone is taken for use, and means is provided rendered effective simultaneously with the removal of the receiver and consequent rise of the switch hook for modifying the effective capacity of the transmission circuit. It will thus be seen that I am enabled to provide the requisite capacity for eflicient ringing, and also, upon the switching in of the talking apparatus, to provide sufficient capacity for proper transmission, thereby making it possible to secure eflicient ringing and good transmission with the least outlay for condensers.

In harmonic systems the best results are obtained when a condenser of one microfarad capacity is used in the ringing circuit, and two microfarads in the talking circuit insures good transmission.

The invention will be particularly described in its embodiment in the substation circuit illustrated in the accompanying drawing.

Referring to the drawing, A designates the usual ringer'in series with a condenser H. in the normal circuit of the line conductors 1, 2. The telephone transmitter B and one winding of an induction coil C are included in a normally open bridge of the line conductors, 1, 2 and are arranged to be brought into circuit upon the removal of the telephone receiver D from its switchhook E, said receiver and its associated winding of the induction coil C being also brought into circuit upon the removal of the telephone. A lever I, secured to the switch-hook E by means of an insulated block F, closes at contact 4, when the tele phone is removed from its hook, a. circuit 3 including a condenser G in parallel with the said condenser H.

When the receiver-hook is in its normal or depressed position, the circuit is through the call-bell A and condenser H. When the switch-hook rises, uponthe removal of the receiver, a local telephonic circuit is closed which includes the receiver D and transmitter B in series with the condensers Gr and H in parallel, the condenser G being included in said circuit in multiple with condenser H by the closure of contact 4 by the lever I attached to the switchhook. It will thus be apparent that the circuit normally is provided with adequate capacity for ringing, and upon the removal of the receiver suitable additional capacity is introduced in the circuit to insure eflicient transmission.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a substation telephone apparatus, the combination with the line circuit, of signaling apparatus and a condenser normally connected therewith, telephonic apparatus in a normally open bridge of the line, a switch for closing said bridge and including in circuit therewith said condenser, and means actuated in the movement of said switch for modifying the capacity of the circuit.

2. In a substation telephone circuit, the combination with the line conductors, of signaling apparatus connected therewith, a condenser associated with said signaling apparatus, telephonic apparatus in a normally open bridge of the line adapted to be included in circuit with said condenser, a second condenser, and a switch actuated upon the removal of the telephone for closing said bridge and including both said condensers in circuit therewith.

3. In a substation telephone circuit, the combination with the line conductors, of signaling apparatus connected therewith, a condenser associated with said signaling apparatus, telephonic apparatus in a normallyopen bridge of the'line and adapted to be included in circuit with said condenser, and a switch actuated upon the removal of the telephone for effectuating such inclusion and for simultaneously increasing the capacity of the circuit.

4:. In a substation telephone circuit, the

combination with the line conductors, of

signaling apparatus connected therewith, a condenser associated with said signaling apparatus, telephonic apparatus in a normally-open bridge of the line, a switch actuated upon the removal of the telephone for use for closing said bridge and including said telephonic apparatus in circuit with said condenser and a second condenser adapted to be included in parallel with the first condenser by the operation of said switch.

In witness whereof, I hereunto subscribe my name this ninth day of March A. D.

JOHN J. LYN G. Witnesses:

RUSH F. NnWooMB, IRVING MACDONALD. 

